Blizzard won't end World of Warcraft until it becomes financially irresponsible to keep the game running. It certainly isn't going to write a definite ending in. Blizzard will keep churning content out as long as the game sustains itself. If we end up fighting Sargeras in WoW's lifetime, it will most likely just be revealed that something even worse is around the corner.
What's up with poison gas storage sitting in the back of the ruins above undercity? Is it supposed to imply sylvannas is up to something?
Imply? We are way beyond implications, brother. Sylvanas is riding the crazy train as fast as it'll go. Just look around the Eastern Kingdoms in Cataclysm. Sylvanas is actively wielding plagues in battle, obliterating Gilneas, Hillsbrad, et cetera, and raising the dead as her servants. She's dag nasty evil. Remember the plague that Putress used at the Wrathgate? It only existed because Sylvanas told him to create it. Now that Putress and Varimathras are out of the way, she's happily using it wherever and whenever she wants, all according to plan.
I would not be surprised for one single moment if we learn that Sylvanas is current holder of the shards of Frostmourne.
On the topic of new playable races: what do you think would be the next races for Horde and Alliance? I know we just got new races, I'm just wondering. Arroka would be nice for Horde. I love those little bird men. :)
Frankly, I think there are plenty of races -- Blizzard isn't even utilizing the potential of the ones it has. There needs to be some focus on the less-loved races of the Horde and the Alliance before Blizzard thinks about adding more. Because of that, I haven't put a lot of thought into which races it could add.
That being said, I suspect the arrakoa would more likely be an Alliance race! If you pay attention in The Burning Crusade, many of the arrakoa who are friendly to players are arrakoa that turned to the Light and thus abandoned the factions of their race who worship less pleasant deities. The overall arc of the draenei is to build an army of the Light, so if there were a friendly faction of arrakoa, they would probably be Light-worshipping birdies who sign on with the Alliance. The Horde can have ... I don't know, ogres, I guess. Definitely not ethereals; those guys are way too cool as a neutral faction.
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